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Local spectroscopy of edge channels in the quantum Hall regime with local probe techniques

Ihn, Thomas ; Rychen, J. ; Vancura, T. ; Ensslin, Klaus ; Wegscheider, Werner ; Bichler, Max
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Date of publication of this fulltext: 07 Dec 2009 13:20


Abstract

We present measurements of the tunnelling conductance between edge channels in the quantum Hall regime. By using a local potential perturbation induced by the tip of a scanning force microscope we are able to enhance the tunnelling coupling and map its strength along the edge of the two-dimensional electron gas. It is suggested that the presented method is promising for the local investigation of inter-edge-channel scattering and edge-channel equilibration.


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